Optimizing Test Boards for 50 GHz End Launch Connectors
36Pages

The Performance Leader in Microwave Connectors Optimizing Test Boards for 50 GHz End Launch Connectors Grounded Coplanar Launches and Through Lines on 30 mil Rogers 4350 with Comparison to Microstrip Southwest Microwave, Inc. www.southwestmicrowave.com

Southwest Microwave, Inc. Optimizing Test Boards for 50 GHz End Launch Connectors: Grounded Coplanar Launches and Through Lines on 30 mil Rogers 4350 with Comparison to Microstrip Bill Rosas, Product Engineering Manager, Southwest Microwave, Inc. Copyright © 2007 by Southwest Microwave, Inc. and Bill Rosas. All rights reserved. Petra Microwave®, Ltd., Rogers Corporation®, CST®-Computer Simulation Technology, and CST Microwave Studio® 2006 are all registered trademarks of their respective companies. Southwest Microwave, Inc. • Tempe, Arizona 85284 USA • 480-783-0201 • www.southwestmicrowav

Table of Contents Test Equipment and Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Analyzer Workstation (HP 8510C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Southwest Microwave Standard S-Parameter Plot . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Scope of the Evaluation . . . ....

Test Equipment and Techniques An Agilent 8510D network analyzer was used for most of the published measurements (in the loss section an Agilent PNA was used). The test port connectors used were 2.4 mm connectors and the frequency range for all measurements was DC to 50 GHz. Calibration was a full 12-term SOLT calibration with sliding loads. The TDR measurements were set up as low pass step in real units. All of the data was taken from the same calibration. Some internal verification of data was done on an Anritsu 37297 network analyzer. Analyzer Workstation (HP 8510C) ► 12-term SOLT...

Southwest Microwave Standard S-Parameter Plot S-parameter data: The format of the data is S11 on the bottom of the graph in VSWR with scale of 0.2 per division, and S21 on the top of the graph in Log Mag with a scale of 1 dB per division. SMI Standard Format of S-Parameter Data Test data original 30 mil GCPWG test board (Serial Number Ø). Purpose For many years Southwest Microwave, Inc. has manufactured field replaceable connectors and launch accessories where connector performance was easily verified by measuring two connectors back-to-back as a two-port device. The responsibility for...

Comparison of GCPWG and Microstrip Straight microstrip test board 15c, 30 mil RO4350, S/N = 51, (with actual test results). This study was conducted by (SMI) to evaluate grounded coplanar waveguide (GCPWG) launches and lines, top ground (coplanar) launches to microstrip lines, and microstrip lines running straight to the edge of the board on 30 mil Rogers 4350 boards. Microstrip structures on substrates this thick (0.030”) have many drawbacks. There is the effect of dispersion which changes the impedance of the line over frequency. There is also significant radiated loss from microstrip at...

SOUTHWEST MICROWAVE Actual two connectors used for all of the test results found in this paper. Connector Model The connectors used are SMI end launch connector assemblies, model number 1492-02A-5. These connectors were designed for single-layer and multi-layer boards where the top layer is the microwave layer. The 1492-02A-5 has a 2.4 mm female connector and a transition block with a 10 mil diameter circuit launch pin and a 63.5 mil diameter coaxial ground. Because they were for multi-layer boards there is a 20 mil overhang of the ground over the board to catch the top ground of the board....

End Launch Connector Features: ► Southwest Microwave end Launch connector assemblies, model number 1492-02A-5. ► Used on single-layer boards. ► Used on multi-layer boards where the top layer is the microwave layer. ► No soldering is needed. ► Usable with any board thickness. Review of Original Test Board (2003) When the end launch connectors were first introduced in 2003, a one-inch long GCPWG test board was developed for testing. One of these original test boards was used in this study to establish the baseline performance of the connectors. Below are the results of the original end launch...

Board Ø (2003) Original 30 mil coplanar test board. Test data original 30 mil coplanar test board (Serial Number Ø). Board Ø (2003) Serial Number = Ø Trace = 0.045” Ground = 0.064” Via Size = 0.020” Via Spacing = 0.040” Via Rows = 0.112” Fabricated = 2003 TDR of original coplanar test board (Serial Number Ø). Time Domain (TDR) Test Data The TDR data is in real units over time. It shows the discontinuity at the launch and the impedance of the board. Southwest Microwave, Inc. • Tempe, Arizona 85284 USA • 480-783-0201 • www.southw

Reproduction of Original Test Board (2007) This reproduction was fabricated in the same lot in 2007 as the test boards used in the rest of this study. The purpose is to tie the results of this lot of boards to the results from the original test board fabricated in 2003. Below are the results of the reproduction of the original test board. The results are very similar to the original board including the glitch in the insertion loss at 45 GHz. The VSWR slowly rises through 45 GHz to 1.6:1 as on the original board. Board 1 (2007) Serial Number = 19 Trace = 0.045” Ground = 0.064” Via Size =...

3-D Simulation (Original GCPWG Test Board) Simulation can be used to predict results of these types of structures then changes are made and the results of that change are viewed without having to fabricate and test actual hardware. Decent correlation of the known performance of this test board was achieved with CST Microwave Studio® (CST MWS) Simulation. CST provided the simulations. CST MWS Model Without Connectors CST MWS Model The 3-D simulation model is created by only looking at the transition blocks and the test board. The biggest discontinuity in the transmission line is the...